Clean up thread handling in Blimp browser tests.

blimp/engine/app/blimp_browser_main_parts.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "blimp/engine/app/blimp_browser_main_parts.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 51 matching lines @@
 
 SettingsManager* BlimpBrowserMainParts::GetSettingsManager() {
   return settings_manager_.get();
 }
 
 BlobChannelSender* BlimpBrowserMainParts::GetBlobChannelSender() {
   return engine_session_->blob_channel_sender();
 }
 
 BlobChannelService* BlimpBrowserMainParts::GetBlobChannelService() {
-  return engine_session_->blob_channel_service();
+  return engine_session_->GetBlobChannelService();
 }
 
 BlimpEngineSession* BlimpBrowserMainParts::GetBlimpEngineSession() {
   return engine_session_.get();
 }
 
 }  // namespace engine
 }  // namespace blimp